by house search for a second suspect in the boston bombings. >>19-year-olddzhokhartsarnaevisbeing sought after he escaped from a shoot off -- shootout with police that caused his brother his life. police have envied the streets of suburban watertown, where the wanted man is believed to be holed up. >> all public transportation, taxi services, is shut down. schools are close, and people are being told to remain indoors. >> boston police are carrying out a door-to-door search for the second bombing suspect. they believe he is hiding here in watertown just a few kilometers outside the city. a spokesman for the force has asked residents to keep calm. >> our number one priority is with these neighborhoods in watertown and making them safe and finding this individual. that is what we are committed to. we have made significant progress, but it may take hours to do this. >> police have told people to stay home with the windows shut and not open the doors to anyone other than uniformed police officers. the suspect is potentially armed and dangerous. the two suspects brought a convenience s